linux-kernel - [RESEND][PATCHv2 3/3] NOMERGE: Sample driver

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Message-Id: <1452548364-9522-4-git-send-email-laura@labbott.name>
Date:	Mon, 11 Jan 2016 13:39:24 -0800
From:	Laura Abbott <laura@...bott.name>
To:	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Andrew Andrianov <andrew@...mnt.org>, <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>
Cc:	Laura Abbott <laura@...bott.name>,
	John Stultz <john.stultz@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tom Gall <tom.gall@...aro.org>,
	Colin Cross <ccross@...gle.com>, devel@...verdev.osuosl.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	romlem@...gle.com, mitchelh@...eaurora.org,
	linux-arm-kernel@...ts.infradead.org,
	Feng Tang <feng.tang@...el.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mark Rutland <mark.rutland@....com>
Subject: [RESEND][PATCHv2 3/3] NOMERGE: Sample driver



Small sample driver to show what setup would look like with the dt
bindings

Signed-off-by: Laura Abbott <laura@...bott.name>
---
 drivers/staging/android/ion/Kconfig         |  6 ++
 drivers/staging/android/ion/Makefile        |  1 +
 drivers/staging/android/ion/ion_of_sample.c | 96 +++++++++++++++++++++++++++++
 3 files changed, 103 insertions(+)
 create mode 100644 drivers/staging/android/ion/ion_of_sample.c

diff --git a/drivers/staging/android/ion/Kconfig b/drivers/staging/android/ion/Kconfig
index 9b6d65d..c2afb35 100644
--- a/drivers/staging/android/ion/Kconfig
+++ b/drivers/staging/android/ion/Kconfig
@@ -43,3 +43,9 @@ config ION_OF
 	  extensions
 
 	  If using Ion and devicetree, you should say Y here
+
+config ION_OF_SAMPLE
+	bool "Sample driver"
+	depends on ION_OF
+	help
+	  Small sample driver showing the Ion OF interface
diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index a77417b..1309b91 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -8,4 +8,5 @@ endif
 obj-$(CONFIG_ION_DUMMY) += ion_dummy_driver.o
 obj-$(CONFIG_ION_TEGRA) += tegra/
 obj-$(CONFIG_ION_OF) += ion_of.o ion_physmem.o
+obj-$(CONFIG_ION_OF_SAMPLE) += ion_of_sample.o
 
diff --git a/drivers/staging/android/ion/ion_of_sample.c b/drivers/staging/android/ion/ion_of_sample.c
new file mode 100644
index 0000000..bbcdf4d
--- /dev/null
+++ b/drivers/staging/android/ion/ion_of_sample.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2015 RC Module
+ * Andrew Andrianov <andrew@...mnt.org>
+ * Also based on work from Google, The Linux Foundation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include "ion.h"
+#include "ion_priv.h"
+#include "ion_of.h"
+
+struct sample_ion_dev {
+        struct ion_heap         **heaps;
+        struct ion_device       *idev;
+};
+
+static struct ion_of_heap heaps[] = {
+	PLATFORM_HEAP("sample-system", 0, ION_HEAP_TYPE_SYSTEM, "system"),
+	PLATFORM_HEAP("sample-camera", 1, ION_HEAP_TYPE_DMA, "camera"),
+	PLATFORM_HEAP("sample-fb", 2, ION_HEAP_TYPE_DMA, "fb"),
+	{}
+};
+
+static int ion_sample_probe(struct platform_device *pdev)
+{
+	struct ion_platform_data *data;
+	struct sample_ion_dev *ipdev;
+	int i;
+
+	ipdev = devm_kzalloc(&pdev->dev, sizeof(*ipdev), GFP_KERNEL);
+	if (!ipdev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, ipdev);
+
+	ipdev->idev = ion_device_create(NULL);
+	if (!ipdev->idev)
+		return -ENOMEM;
+
+	data = ion_parse_dt(pdev, heaps);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	ipdev->heaps = devm_kzalloc(&pdev->dev,
+				sizeof(struct ion_heap)*data->nr, GFP_KERNEL);
+
+	if (!ipdev->heaps)
+		return -ENOMEM;
+
+	for (i = 0; i < data->nr; i++) {
+		ipdev->heaps[i] = ion_heap_create(&data->heaps[i]);
+		if (!ipdev->heaps[i])
+			return -ENOMEM;
+		ion_device_add_heap(ipdev->idev, ipdev->heaps[i]);
+	}
+	return 0;
+}
+
+static int ion_sample_remove(struct platform_device *pdev)
+{
+	/* Everything should be devm */
+	return 0;
+}
+
+static const struct of_device_id of_match_table[] = {
+	{ .compatible = "sample-ion", },
+	{ /* end of list */ }
+};
+
+static struct platform_driver ion_sample_driver = {
+	.probe		= ion_sample_probe,
+	.remove		= ion_sample_remove,
+	.driver		= {
+		.name	= "ion-of",
+		.of_match_table = of_match_ptr(of_match_table),
+	},
+};
+
+static int __init ion_sample_init(void)
+{
+	return platform_driver_register(&ion_sample_driver);
+}
+device_initcall(ion_sample_init);
-- 
2.5.0